Hey, i'm 22 yrs old ..5'10'' , about 170 lbs. I have have been lifting for years. It seems my body has reached it's limit. I just cant gain any weight or size. No matter how many calories i take in, i just dont gain weight. My question is, is weight gain absolutely necassary to gain size? I've heard people say weight gain and size come "hand n hand". I mean it makes sense. But if this is true does this mean i can lift as hard as i want and, never see size gains??